package com.lzh.gulimall.order.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.lzh.common.exception.NoStockException;
import com.lzh.common.to.OrderTo;
import com.lzh.common.to.mq.SeckillOrderTo;
import com.lzh.common.utils.R;
import com.lzh.common.vo.MemberResponseVo;
import com.lzh.gulimall.order.config.alipay.PayVo;
import com.lzh.gulimall.order.constant.OrderConstant;
import com.lzh.gulimall.order.constant.PayConstant;
import com.lzh.gulimall.order.entity.OrderItemEntity;
import com.lzh.gulimall.order.entity.PaymentInfoEntity;
import com.lzh.gulimall.order.enume.OrderStatusEnum;
import com.lzh.gulimall.order.feign.CartFeignService;
import com.lzh.gulimall.order.feign.MemberFeignService;
import com.lzh.gulimall.order.feign.ProductFeignService;
import com.lzh.gulimall.order.feign.WmsFeignService;
import com.lzh.gulimall.order.interceptor.LoginUserInterceptor;
import com.lzh.gulimall.order.service.OrderItemService;
import com.lzh.gulimall.order.service.PaymentInfoService;
import com.lzh.gulimall.order.to.OrderCreateTo;
import com.lzh.gulimall.order.to.SpuInfoVo;
import com.lzh.gulimall.order.vo.*;
import io.seata.spring.annotation.GlobalTransactional;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lzh.common.utils.PageUtils;
import com.lzh.common.utils.Query;
import com.lzh.gulimall.order.dao.OrderDao;
import com.lzh.gulimall.order.entity.OrderEntity;
import com.lzh.gulimall.order.service.OrderService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

@Service("orderService")
public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService {
    private ThreadLocal<OrderSubmitVo>  confirmVoThreadLocal=new ThreadLocal<>();

    @Autowired
    private MemberFeignService memberFeignService;
    @Autowired
    private CartFeignService cartFeignService;
    @Autowired
    private ThreadPoolExecutor threadPoolExecutor;
    @Autowired
    private WmsFeignService wmsFeignService;
    @Autowired
    private RedisTemplate redisTemplate;
    @Autowired
    private ProductFeignService productFeignService;
    @Autowired
    private OrderItemService orderItemService;
    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private PaymentInfoService paymentInfoService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
        );

        return new PageUtils(page);
    }

    /**
     * 确认订单
     * @return
     */
    @Override
    public OrderConfirmVo confirmOrder() {
        OrderConfirmVo orderConfirmVo=new OrderConfirmVo();
        //当前登录的用户
        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();

        //获取旧线程的RequestAttributes
        //RequestContextHolder底层使用的是ThreadLocal
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        //1.异步任务1 - 远程查询所有的收货地址列表
        CompletableFuture<Void> voidCompletableFuture = CompletableFuture.runAsync(() -> {
            //将旧线程中的RequestAttributes，设置到线程中的RequestContextHolder里
            RequestContextHolder.setRequestAttributes(requestAttributes);


            List<MemberAddressVo> address = memberFeignService.getAddress(memberResponseVo.getId());
            orderConfirmVo.setMemberAddressVos(address);
        }, threadPoolExecutor);


        //2.异步任务2 - 远程查询购物车所有选中的购物项
        //feign在远程调用之前要构造请求，调用很多的拦截器
        CompletableFuture<Void> voidCompletableFuture1 = CompletableFuture.runAsync(() -> {
            //将旧线程中的RequestAttributes，设置到线程中的RequestContextHolder里
            RequestContextHolder.setRequestAttributes(requestAttributes);

            List<OrderItemVo> currentCartItems = cartFeignService.getCurrentCartItems();
            orderConfirmVo.setItems(currentCartItems);
        }, threadPoolExecutor).thenRunAsync(()->{
            List<OrderItemVo> items = orderConfirmVo.getItems();
            List<Long> collect1 = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList());
            R skuHasStock = wmsFeignService.getSkuHasStock(collect1);
            List<SkuStockVo> data = (List<SkuStockVo>) skuHasStock.getData(new TypeReference<List<SkuStockVo>>(){});
            if (data!=null){
                Map<Long, Boolean> collect = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
                orderConfirmVo.setStocks(collect);
            }
        },threadPoolExecutor);

        try {
            //等待所有任务完成
            CompletableFuture.allOf(voidCompletableFuture,voidCompletableFuture1).get();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

        //3.查询用户积分
        Integer integration = memberResponseVo.getIntegration();
        orderConfirmVo.setIntegration(integration);

        //4.其他数据自动计算

        //5.防重令牌
        String token = UUID.randomUUID().toString().replace("-", " ");
        redisTemplate.opsForValue().set(OrderConstant.USER_ORDER_TOKEN_PREFIX+memberResponseVo.getId(),token,30, TimeUnit.MINUTES);
        orderConfirmVo.setOrderToken(token);

        return orderConfirmVo;
    }

    /**
     * 下单
     * 下单，去创建订单，验令牌，验价格，锁库存
     * @param orderSubmitVo
     * @return
     */
    @Transactional
//    @GlobalTransactional(name = "fsp-create-order",rollbackFor = Exception.class)
    @Override
    public SubmitOrderResponseVo submitOrder(OrderSubmitVo orderSubmitVo) {
        SubmitOrderResponseVo submitOrderResponseVo=new SubmitOrderResponseVo();
        submitOrderResponseVo.setCode(0);
        //当前登录的用户
        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();
        confirmVoThreadLocal.set(orderSubmitVo);

        //1、验令牌【令牌：获取，对比，删除。必须保证原子性】
        //前端传的token
        String token = orderSubmitVo.getOrderToken();
        //0令牌验证失败  1验证成功
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        //lua脚本保证原子性：获取令牌，验证令牌和删除令牌
        Long result = (Long) redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class),
                Arrays.asList(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberResponseVo.getId()),
                token);
        //验证失败
        if (result==0){
            submitOrderResponseVo.setCode(1);
            return submitOrderResponseVo;
        }
        //验证成功
        else {
            //2、下单
            OrderCreateTo order = createOrder();

            //3、验价
            BigDecimal payAmount = order.getOrder().getPayAmount();
            BigDecimal payPrice = orderSubmitVo.getPayPrice();
            if(Math.abs(payAmount.subtract(payPrice).doubleValue())>=0.01){
                submitOrderResponseVo.setCode(2);
                return submitOrderResponseVo;
            }

            //4、保存订单
            saveOrder(order);

            //5、库存锁定。只要有异常回滚订单数据
            //需要：订单号，所有订单项(sku_id,sku_name)，锁几件
            WareSkuLockVo wareSkuLockVo = new WareSkuLockVo();
            wareSkuLockVo.setOrderSn(order.getOrder().getOrderSn());
            List<OrderItemVo> collect = order.getOrderItems().stream().map(item -> {
                OrderItemVo orderItemVo = new OrderItemVo();
                orderItemVo.setSkuId(item.getSkuId());
                orderItemVo.setCount(item.getSkuQuantity());
                orderItemVo.setTitle(item.getSkuName());
                return orderItemVo;
            }).collect(Collectors.toList());
            wareSkuLockVo.setLocks(collect);
            //远程锁库存
            R r = wmsFeignService.orderLockStock(wareSkuLockVo);
            if (r.getCode()==0){
                //锁成功
                submitOrderResponseVo.setOrder(order.getOrder());

                //todo 远程扣减积分，出异常
                //出现分布式事务问题：订单回滚(本地事务感知到，能够回滚)，库存不回滚
                //我们想要的是，都回滚
//                int i=10/0;

                //订单创建成功发消息给mq，把这个消息路由到死信队列里
                rabbitTemplate.convertAndSend("order-event-exchange","order.create.order",order.getOrder());

                return submitOrderResponseVo;

            }else {
                //锁定失败
                String msg = (String) r.get("msg");
                throw new NoStockException(msg);
            }
        }
    }

    /**
     * 按照订单号获取订单信息
     * @param orderSn
     * @return
     */
    @Override
    public OrderEntity getOrderByOrderSn(String orderSn) {

        OrderEntity orderEntity = this.baseMapper.selectOne(new QueryWrapper<OrderEntity>().eq("order_sn", orderSn));

        return orderEntity;
    }


    /**
     * 关闭订单
     * @param orderEntity
     */
    @Override
    public void closeOrder(OrderEntity orderEntity) {

        //关闭订单之前先查询一下数据库，判断此订单状态是否已支付
        OrderEntity orderInfo = this.getOne(new QueryWrapper<OrderEntity>().
                eq("order_sn",orderEntity.getOrderSn()));

        if (orderInfo.getStatus().equals(OrderStatusEnum.CREATE_NEW.getCode())) {
            //代付款状态进行关单
            OrderEntity orderUpdate = new OrderEntity();
            orderUpdate.setId(orderInfo.getId());
            orderUpdate.setStatus(OrderStatusEnum.CANCLED.getCode());
            this.updateById(orderUpdate);

            // 发送消息给MQ
            OrderTo orderTo = new OrderTo();
            BeanUtils.copyProperties(orderInfo, orderTo);

            try {
                //TODO 确保每个消息发送成功，给每个消息做好日志记录，(给数据库保存每一个详细信息)保存每个消息的详细信息
                rabbitTemplate.convertAndSend("order-event-exchange", "order.release.other", orderTo);
            } catch (Exception e) {
                //TODO 定期扫描数据库，重新发送失败的消息
            }
        }
    }

    @Override
    public PayVo getOrderPay(String orderSn) {
        PayVo payVo = new PayVo();
        OrderEntity orderInfo = this.getOrderByOrderSn(orderSn);

        //保留两位小数点，向上取值
        BigDecimal payAmount = orderInfo.getPayAmount().setScale(2, BigDecimal.ROUND_UP);
        payVo.setTotal_amount(payAmount.toString());
        payVo.setOut_trade_no(orderInfo.getOrderSn());

        //查询订单项的数据
        List<OrderItemEntity> orderItemInfo = orderItemService.list(
                new QueryWrapper<OrderItemEntity>().eq("order_sn", orderSn));
        OrderItemEntity orderItemEntity = orderItemInfo.get(0);
        payVo.setBody(orderItemEntity.getSkuAttrsVals());

        payVo.setSubject(orderItemEntity.getSkuName());
        return payVo;
    }

    /**
     * 查询当前用户所有订单数据
     * @param params
     * @return
     */
    @Override
    public PageUtils queryPageWithItem(Map<String, Object> params) {

        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();

        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
                        .eq("member_id",memberResponseVo.getId()).orderByDesc("create_time")
        );

        //遍历所有订单集合
        List<OrderEntity> orderEntityList = page.getRecords().stream().map(order -> {
            //根据订单号查询订单项里的数据
            List<OrderItemEntity> orderItemEntities = orderItemService.list(new QueryWrapper<OrderItemEntity>()
                    .eq("order_sn", order.getOrderSn()));
            order.setOrderItemEntityList(orderItemEntities);
            return order;
        }).collect(Collectors.toList());

        page.setRecords(orderEntityList);

        return new PageUtils(page);
    }

    /**
     * 处理支付宝的支付结果
     * @param asyncVo
     * @return
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public String handlePayResult(PayAsyncVo asyncVo) {

        //保存交易流水信息
        PaymentInfoEntity paymentInfo = new PaymentInfoEntity();
        paymentInfo.setOrderSn(asyncVo.getOut_trade_no());
        paymentInfo.setAlipayTradeNo(asyncVo.getTrade_no());
        paymentInfo.setTotalAmount(new BigDecimal(asyncVo.getBuyer_pay_amount()));
        paymentInfo.setSubject(asyncVo.getBody());
        paymentInfo.setPaymentStatus(asyncVo.getTrade_status());
        paymentInfo.setCreateTime(new Date());
        paymentInfo.setCallbackTime(asyncVo.getNotify_time());
        //添加到数据库中
        this.paymentInfoService.save(paymentInfo);

        //修改订单状态
        //获取当前状态
        String tradeStatus = asyncVo.getTrade_status();

        if (tradeStatus.equals("TRADE_SUCCESS") || tradeStatus.equals("TRADE_FINISHED")) {
            //支付成功状态
            String orderSn = asyncVo.getOut_trade_no(); //获取订单号
            this.baseMapper.updateOrderStatus(orderSn,OrderStatusEnum.PAYED.getCode(), PayConstant.ALIPAY);
        }

        return "success";
    }
    /**
     * 创建订单
     * @return
     */
    private OrderCreateTo createOrder() {

        OrderCreateTo createTo = new OrderCreateTo();

        //1、生成订单号
        String orderSn = IdWorker.getTimeId();
        OrderEntity orderEntity = builderOrder(orderSn);

        //2、获取到所有的订单项
        List<OrderItemEntity> orderItemEntities = builderOrderItems(orderSn);

        //3、验价(计算价格、积分等信息)
        computePrice(orderEntity,orderItemEntities);

        createTo.setOrder(orderEntity);
        createTo.setOrderItems(orderItemEntities);

        return createTo;
    }
    /**
     * 构建订单数据
     * @param orderSn
     * @return
     */
    private OrderEntity builderOrder(String orderSn) {

        //获取当前用户登录信息
        MemberResponseVo memberResponseVo = LoginUserInterceptor.loginUser.get();

        OrderEntity orderEntity = new OrderEntity();
        orderEntity.setMemberId(memberResponseVo.getId());
        orderEntity.setOrderSn(orderSn);
        orderEntity.setMemberUsername(memberResponseVo.getUsername());

        OrderSubmitVo orderSubmitVo = confirmVoThreadLocal.get();

        //远程获取收货地址和运费信息
        R fareAddressVo = wmsFeignService.getFare(orderSubmitVo.getAddrId());
        FareVo fareResp = (FareVo) fareAddressVo.getData("data", new TypeReference<FareVo>() {});

        //获取到运费信息
        orderEntity.setFreightAmount(fareResp.getFare());

        //获取到收货地址信息
        MemberAddressVo address = fareResp.getAddress();
        //设置收货人信息
        orderEntity.setReceiverName(address.getName());
        orderEntity.setReceiverPhone(address.getPhone());
        orderEntity.setReceiverPostCode(address.getPostCode());
        orderEntity.setReceiverProvince(address.getProvince());
        orderEntity.setReceiverCity(address.getCity());
        orderEntity.setReceiverRegion(address.getRegion());
        orderEntity.setReceiverDetailAddress(address.getDetailAddress());

        //设置订单相关的状态信息
        orderEntity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());
        orderEntity.setAutoConfirmDay(7);
        orderEntity.setConfirmStatus(0);
        return orderEntity;
    }


    /**
     * 构建所有订单项数据
     * @return
     */
    public List<OrderItemEntity> builderOrderItems(String orderSn) {

        List<OrderItemEntity> orderItemEntityList = new ArrayList<>();

        //最后确定每个购物项的价格
        List<OrderItemVo> currentCartItems = cartFeignService.getCurrentCartItems();
        if (currentCartItems != null && currentCartItems.size() > 0) {
            orderItemEntityList = currentCartItems.stream().map((items) -> {
                //构建订单项数据
                OrderItemEntity orderItemEntity = builderOrderItem(items);
                //订单号
                orderItemEntity.setOrderSn(orderSn);

                return orderItemEntity;
            }).collect(Collectors.toList());
        }

        return orderItemEntityList;
    }
    /**
     * 构建某一个订单项的数据
     * @param items
     * @return
     */
    private OrderItemEntity builderOrderItem(OrderItemVo items) {
        OrderItemEntity orderItemEntity = new OrderItemEntity();

        //1、商品的spu信息
        Long skuId = items.getSkuId();
        //获取spu的信息
        R spuInfo = productFeignService.getSpuInfoBySkuId(skuId);
        SpuInfoVo spuInfoData = (SpuInfoVo) spuInfo.getData("data", new TypeReference<SpuInfoVo>() {
        });
        orderItemEntity.setSpuId(spuInfoData.getId());
        orderItemEntity.setSpuName(spuInfoData.getSpuName());
        orderItemEntity.setSpuBrand(spuInfoData.getBrandName());
        orderItemEntity.setCategoryId(spuInfoData.getCatalogId());

        //2、商品的sku信息
        orderItemEntity.setSkuId(skuId);
        orderItemEntity.setSkuName(items.getTitle());
        orderItemEntity.setSkuPic(items.getImage());
        orderItemEntity.setSkuPrice(items.getPrice());
        orderItemEntity.setSkuQuantity(items.getCount());

        //使用StringUtils.collectionToDelimitedString将list集合转换为String
        String skuAttrValues = StringUtils.collectionToDelimitedString(items.getSkuAttrValues(), ";");
        orderItemEntity.setSkuAttrsVals(skuAttrValues);

        //3、商品的优惠信息

        //4、商品的积分信息
        orderItemEntity.setGiftGrowth(items.getPrice().multiply(new BigDecimal(items.getCount())).intValue());
        orderItemEntity.setGiftIntegration(items.getPrice().multiply(new BigDecimal(items.getCount())).intValue());

        //5、订单项的价格信息
        orderItemEntity.setPromotionAmount(BigDecimal.ZERO);
        orderItemEntity.setCouponAmount(BigDecimal.ZERO);
        orderItemEntity.setIntegrationAmount(BigDecimal.ZERO);

        //当前订单项的实际金额.总额 - 各种优惠价格
        //原来的价格
        BigDecimal origin = orderItemEntity.getSkuPrice().multiply(new BigDecimal(orderItemEntity.getSkuQuantity().toString()));
        //原价减去优惠价得到最终的价格
        BigDecimal subtract = origin.subtract(orderItemEntity.getCouponAmount())
                .subtract(orderItemEntity.getPromotionAmount())
                .subtract(orderItemEntity.getIntegrationAmount());
        orderItemEntity.setRealAmount(subtract);

        return orderItemEntity;
    }
    /**
     * 计算价格的方法
     * @param orderEntity
     * @param orderItemEntities
     */
    private void computePrice(OrderEntity orderEntity, List<OrderItemEntity> orderItemEntities) {
        //总价
        BigDecimal total = new BigDecimal("0.0");
        //优惠价
        BigDecimal coupon = new BigDecimal("0.0");
        BigDecimal intergration = new BigDecimal("0.0");
        BigDecimal promotion = new BigDecimal("0.0");

        //积分、成长值
        Integer integrationTotal = 0;
        Integer growthTotal = 0;

        //订单总额，叠加每一个订单项的总额信息
        for (OrderItemEntity orderItem : orderItemEntities) {
            //优惠价格信息
            coupon = coupon.add(orderItem.getCouponAmount());
            promotion = promotion.add(orderItem.getPromotionAmount());
            intergration = intergration.add(orderItem.getIntegrationAmount());

            //总价
            total = total.add(orderItem.getRealAmount());

            //积分信息和成长值信息
            integrationTotal += orderItem.getGiftIntegration();
            growthTotal += orderItem.getGiftGrowth();
        }
        //1、订单价格相关的
        orderEntity.setTotalAmount(total);
        //设置应付总额(总额+运费)
        orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));
        orderEntity.setCouponAmount(coupon);
        orderEntity.setPromotionAmount(promotion);
        orderEntity.setIntegrationAmount(intergration);

        //设置积分成长值信息
        orderEntity.setIntegration(integrationTotal);
        orderEntity.setGrowth(growthTotal);

        //设置删除状态(0-未删除，1-已删除)
        orderEntity.setDeleteStatus(0);
    }
    /**
     * 保存订单所有数据
     * @param orderCreateTo
     */
    private void saveOrder(OrderCreateTo orderCreateTo) {

        //获取订单信息
        OrderEntity order = orderCreateTo.getOrder();
        order.setModifyTime(new Date());
        order.setCreateTime(new Date());
        //保存订单
        this.baseMapper.insert(order);

        //获取订单项信息
        List<OrderItemEntity> orderItems = orderCreateTo.getOrderItems();
        //批量保存订单项数据
        orderItemService.saveBatch(orderItems);
    }

    /**
     * 创建秒杀单
     * @param seckillOrderTo
     */
    @Override
    public void createSeckillOrder(SeckillOrderTo seckillOrderTo) {
        //保存订单
        OrderEntity orderEntity = new OrderEntity();
        orderEntity.setOrderSn(seckillOrderTo.getOrderSn());
        orderEntity.setMemberId(seckillOrderTo.getMemberId());
        orderEntity.setStatus(OrderStatusEnum.CREATE_NEW.getCode());
        BigDecimal multiply = seckillOrderTo.getSeckillPrice().multiply(new BigDecimal("" + seckillOrderTo.getNum()));
        orderEntity.setPayAmount(multiply);
        this.save(orderEntity);

        //保存订单项信息
        OrderItemEntity orderItem = new OrderItemEntity();
        orderItem.setOrderSn(seckillOrderTo.getOrderSn());
        orderItem.setRealAmount(multiply);
        orderItem.setSkuQuantity(seckillOrderTo.getNum());
        orderItemService.save(orderItem);
    }
}